Software and hardware solution allows user to send SMS-messages by means of multichannel GSM-gateways Polygator. By using GSM-gateway Polygator it is possible to minimize time exprences needed for mass SMS-mailing because mesages being sent via multiple channels wich more likely to using 4 - 32 mobile phones at the same time instead of 1. Multiple number of users can send SMS-messages via GSM-gateway simulaneously . SMS-center keeps functionality of GSM-gateway and still can be used for corporate telephony expences minimization.